EP2754229A1 - Carter de moteur électrique réduisant les émissions acoustiques - Google Patents
Carter de moteur électrique réduisant les émissions acoustiquesInfo
- Publication number
- EP2754229A1 EP2754229A1 EP12750442.1A EP12750442A EP2754229A1 EP 2754229 A1 EP2754229 A1 EP 2754229A1 EP 12750442 A EP12750442 A EP 12750442A EP 2754229 A1 EP2754229 A1 EP 2754229A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- housing
- casing
- sub
- envelope
- envelopes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/24—Casings; Enclosures; Supports specially adapted for suppression or reduction of noise or vibrations
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures
- H02K1/185—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures to outer stators
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Definitions
- the invention relates to a vehicle electric motor housing, specially designed to reduce acoustic emissions.
- the casings according to the invention are particularly suitable for electric motors of motor vehicles.
- electrical machines In general, electrical machines, especially those with switched reluctance, are known to be particularly noisy, with acoustic emissions being between 20dB and 40dB above those of other technologies.
- these machines implement a rotor coupled to a stator enclosed in a housing, and a significant fraction of these noise emissions is due to the casing which radiates very effectively vibrations generated by the cluster of sheets constituting the stator.
- a solution to reduce these noise would increase the rigidity of the housing.
- this technique requires significantly increase the mass of this casing, and this increase in mass goes against the current trend, which is to lighten up the vehicles as much as possible so that they limit their energy consumption and that they therefore have greater autonomy.
- the other limitation presented by this technique is that electrical machines generate noise over a very wide frequency range, and there will always be excitation frequencies over the radiation range of the stiffened housing.
- another acoustic emission reduction technique consists in placing the electric machine, in this case an appliance, in a single-walled housing, said housing and said apparatus being separated from one another. another by a blade of air.
- the reduction of noise is still quite limited because the device is not configured to absorb vibrations.
- Other means for damping the vibrations which are at the origin of acoustic emissions related to the operation of an electric machine have been developed, such as that described in patent US4007388, and which involves a housing in which is placed an electric motor.
- One of the peculiarities of this case is that it is lined with a material damping the acoustic waves.
- the electric motor rests in the housing through damping parts, called silentblocs, and the housing itself is fixed in the vehicle structure also by means of silentblocs.
- the main disadvantages of this assembly is that it is difficult to implement because of the multiplicity of damping parts involved, and that the large dimensions of this housing make it bulky.
- this assembly aims to dampen acoustic emissions over a fairly limited range, between 120Hz and 1000Hz.
- the electric motor housings according to the invention have a geometric specificity to effectively dampen the acoustic emissions generated by the motor over a wide range, ranging from 100Hz to 20000Hz, while remaining of a constant size compared to the casings already existing.
- This geometrical specificity is simple to implement because of the limited number of parts involved, thus making said casings particularly safe and reliable at this acoustic damping function.
- the invention relates to a housing for a vehicle electric motor intended to be housed in said housing.
- the main feature of a housing according to the invention is that it comprises an inner envelope and an outer envelope, said envelopes being separated from each other by an air gap.
- An electric vehicle engine generally involves a rotor and a stator both housed in a housing serving both support and protection.
- a casing according to the invention is specifically configured to attenuate the acoustic emissions produced by the electric motor in operation, by introducing an air gap between the two casings. Indeed, like double-glazed windows, an air gap trapped between two walls is particularly effective in reducing noise. It is assumed that the two casings constituting the casing are rigid, and that the electric motor is intended to be positioned in the envelope interior. It should be noted that the air trapped between the two envelopes is also used to cool the engine.
- the inner envelope and the outer envelope are of cylindrical shape, and are arranged concentrically. This is the simplest embodiment to achieve and also the most efficient, because such a configuration avoids implementing angles between the walls, which could be the source of reflected acoustic waves of greater intensity. .
- the fact that the two envelopes are arranged concentrically, ensures a certain homogeneity in the thickness of the air gap around the housing, making said housing performance over its entire circumference. It is particularly recommended that the inner envelope and the outer envelope do not come into direct contact with one another, in order to avoid any transmission of sound waves without damping.
- the outer casing is coated on its inner wall with a layer absorbing the noises transmitted by the air gap.
- This additional layer added within the casing makes it possible to slightly increase the efficiency of said casing with respect to the damping of the acoustic waves.
- An air space is a free space, suitable for the addition of a suitable damping material according to the desired sound attenuation.
- This layer must not exceed a certain thickness in order not to reduce too much the width of the remaining air gap, a too great reduction may affect the damping properties of said air gap.
- the layer is made of a material selected from a felt and a foam. These materials are light, efficient and little space consuming. They are more flexible and can therefore easily adapt to a given environment. These added materials are preferably bonded to the inner wall of the outer shell.
- the outer casing is constituted by a plastic shell. This is an envelope configuration that is easy to manufacture and gives satisfactory results with respect to noise attenuation. Other materials could be used for the development of the outer casing, such as, for example, a thermoformed felt.
- the inner envelope consists of two sub-envelopes interlocking one into the other.
- the two sub-envelopes are each in the form of a semi-cylindrical shell.
- the inner envelope consists of two complementary parts, not strictly identical to reconstruct a perfectly smooth cylinder, but slightly different dimensions, so that one fits into the other.
- the two shells have at least one overlap zone, said shells being bonded together by a viscous adhesive deposited at each of said overlapping zones.
- the two shells are interconnected by two strips of longitudinal and parallel glue, located opposite one another around the inner casing.
- the use of a viscous adhesive allows the relative movements of one shell relative to the other, to dampen the vibrations of the engine which have repercussions on the surrounding parts. These are movements of very small amplitude, barely visible to the naked eye. These relative displacements make it possible to prevent the generation of excessive stresses on these shells during operation of the electric motor.
- the viscous adhesive has a loss factor greater than 50% and has a Young's modulus of between 10 5 N / m 2 and 10 1 O N / m. 2 .
- Glues meeting these criteria is perfectly suited to the need encountered in terms of relative displacement between the two shells of the inner envelope. But other glues, a little less powerful, can also meet this need.
- the loss factor represents the ratio between the vibratory energy absorbed and the vibratory energy received.
- each sub-envelope is made of a material chosen from steel and aluminum.
- the invention also relates to an assembly of a motor in a housing according to the invention.
- the main characteristic of an assembly according to the invention is that the motor is placed in the inner casing of the housing, said motor and said housing being interconnected by two lateral holding parts.
- These holding pieces may advantageously be in the form of flat objects and of small thickness, and arranged between them in parallel manner.
- the plane of these holding pieces is perpendicular to the longitudinal axis of the casing, or to its axis of revolution if said casing was of cylindrical shape.
- the motor is separated from the inner casing of the casing by an air gap.
- the assembly of the engine in the casing comprises two air knives, one between the inner and outer casings of the casing, the other being between said inner casing and the motor.
- This second air gap contributes to increasing the reduction of acoustic waves emitted by the engine in operation, and which have repercussions on all the parts involved in this assembly. Like the first air space previously described, this second air space also contributes to cooling the engine.
- each sub-envelope constituting the inner casing of the housing is fixed rigidly to a different holding part.
- each sub-envelope is found in contact with only one holding part.
- the inner casing of the housing is thus fixed rigidly to the two holding parts, and has a flexible central attachment zone, materialized by the two viscous adhesive strips connecting said sub-envelopes together.
- each adhesive strip may be continuous or may be represented by a plurality of separate and aligned glue points.
- the housings for electric vehicle engine according to the invention have the advantage of filling four distinct functions, support, protection, noise attenuation and cooling, while remaining of a constant size. They also have the advantage of being of simple geometry, allowing them, on the one hand, to be easy and quick to machine, and on the other hand, to be able to adapt to different types of electric motors at the same time. means of an easily achievable dimensional readjustment. Finally, they have the advantage of being particularly effective in attenuating the acoustic waves coming from the motor in operation, thanks to a judicious arrangement of different materials already existing.
- FIG. 1 is a diagrammatic sectional view of an assembly of a motor in a housing according to the invention
- FIG. 2 is a partial perspective view of the assembly of FIG. 1,
- an electric motor 1 conventionally comprises a rotor 2 mounted on a rotating shaft 3, and a stator 4 placed around said rotor 2, these three elements 2, 3, 4 defining an assembly having a substantially cylindrical shape.
- This electric motor 1 is placed in a casing 5 of generally cylindrical shape, two lateral parts 6 of support providing a rigid connection between said motor 1 and said casing 5.
- Each lateral piece 6 of support is constituted by a body 7 hollow cylindrical, one end of which is open and the other end of which is partially closed by an annular disk 8 planar and thin, said disk 8 being perpendicular to the axis of revolution of said body 7.
- the outer diameter of the disk 8 is greater than the diameter of the body 7, while its inner diameter is smaller than the diameter of said body 7.
- the casing 5 comprises a cylindrical outer casing 9, constituted by a thermoformed felt or a plastic shell impervious to the passage of air, and whose inner lateral wall is covered by a layer 10 able to absorb the acoustic waves.
- the material constituting this layer is advantageously constituted either by a foam or by a felt, the emergent surface of this layer being made by means of a nonwoven material, in order to prevent the passage of air, either in full, or partially.
- the casing 5 also comprises an inner casing 11 made in two sub-envelopes 12, 13 substantially semi-cylindrical each.
- These two sub-envelopes 12, 13 are comparable to shells steel or aluminum placed in a complementary manner to reconstruct an inner casing 11 almost cylindrical. Indeed, these two sub-envelopes 12, 13 not having exactly the same dimensions, they can not cooperate together to exactly match their circular edges and thus obtain a cylindrical casing 11 perfectly smooth.
- Each sub-envelope 12, 13 is fixed rigidly to a different holding piece 6 to ensure the mechanical strength of the inner envelope 11, said sub-envelopes 12, 13 being connected together by gluing, by means of a viscous glue 14 deposited in the two longitudinal strips of overlap between said sub-envelopes 12, 13.
- a viscous glue 14 deposited in the two longitudinal strips of overlap between said sub-envelopes 12, 13.
- the layer 14 of viscous glue placed between the two sub-envelopes 12, 13 contributes to the damping of the acoustic emissions by allowing this relative movement between said sub-envelopes 12, 13.
- an air knife 15 is formed between the outer casing 9 and the inner casing 11 of the casing 5, to avoid any direct contact area between the two envelopes 9, 11 of the housing 5.
- the presence of this air gap 15 between the two envelopes 9, 11 of the housing 5 and the damping layer 10 lining the inner wall of the outer casing 9, decreases very significantly, the noise emissions due to vibration of the engine 1 in operation.
- the engine 1 is placed in the inner envelope 11 so as to maintain a second air gap 16 with said inner envelope 11.
- This second air gap 16 is an additional means for lowering the sound level of the engine 1 Operating.
- the outer casing 9 is connected to the inner casing 11 via two circular seals 17,18 lateral filtering, stopping the propagation of vibrations between said envelopes 9, 11.
- the two air blades 15, 16 set implemented during the assembly of the engine 1 in the housing 5, also allow said motor 1 to be cooled.
- the inner envelope 11 constituted by the two sub-envelopes 12, 13 connected together by gluing can be prefabricated by rolling, then be shaped and mounted on the side holding pieces 6.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1157838A FR2979768B1 (fr) | 2011-09-05 | 2011-09-05 | Carter de moteur electrique reduisant les emissions acoustiques |
PCT/FR2012/051735 WO2013034824A1 (fr) | 2011-09-05 | 2012-07-20 | Carter de moteur électrique réduisant les émissions acoustiques |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2754229A1 true EP2754229A1 (fr) | 2014-07-16 |
Family
ID=46724507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12750442.1A Withdrawn EP2754229A1 (fr) | 2011-09-05 | 2012-07-20 | Carter de moteur électrique réduisant les émissions acoustiques |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2754229A1 (fr) |
FR (1) | FR2979768B1 (fr) |
WO (1) | WO2013034824A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102013207931A1 (de) * | 2013-04-30 | 2014-10-30 | Wobben Properties Gmbh | Synchrongenerator-Stator und Synchrongenerator |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3395296A (en) * | 1965-10-01 | 1968-07-30 | Reliance Electric & Eng Co | Dynamoelectric machine mounting with reduced stator vibration |
DE2000236B2 (de) | 1970-01-03 | 1977-10-13 | Sctiorch GmbH, 4Q50 Mönchengladbach | Schallschutzhaube fuer elektrische maschinen mit oberflaechenkuehlung |
DE2331689A1 (de) * | 1973-06-22 | 1975-01-16 | Schorch Gmbh | Schallgedaempftes gehaeuse fuer elektrische motoren |
US4007388A (en) | 1975-06-19 | 1977-02-08 | General Electric Company | Dynamoelectric machine load package having an acoustically isolated enclosure |
US5272285A (en) * | 1992-08-20 | 1993-12-21 | Scott Mfg., Inc. | Sound attenuating machinery cover |
JP3877898B2 (ja) * | 1999-02-23 | 2007-02-07 | 三菱電機株式会社 | 車両用交流発電機 |
-
2011
- 2011-09-05 FR FR1157838A patent/FR2979768B1/fr active Active
-
2012
- 2012-07-20 WO PCT/FR2012/051735 patent/WO2013034824A1/fr active Application Filing
- 2012-07-20 EP EP12750442.1A patent/EP2754229A1/fr not_active Withdrawn
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2013034824A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2013034824A1 (fr) | 2013-03-14 |
FR2979768A1 (fr) | 2013-03-08 |
FR2979768B1 (fr) | 2014-08-08 |
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Legal Events
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RIN1 | Information on inventor provided before grant (corrected) |
Inventor name: ZHANG, CHARLES Inventor name: GAY, SEBASTIEN |
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